Answer:
9x4500=40,500. which is a little more then what you need but it will still be a little more but it will take around 40500 days to run around the world.
- Light energy from sun is converted into electrical energy in a solar cell.
- Electrical energy is stored as chemical energy in the solar cell.
- Chemical energy is converted back into electrical energy at night.
- Electrical energy is converted into light energy from the street lamp.
Most covalent compounds have relatively low melting points and boiling points. Covalent compounds usually have lower enthalpies of fusion and vaporization than ionic compounds. Covalent compounds tend to be more flammable than ionic compounds. When dissolved in water, they don't conduct electricity.
Source: https://socratic.org/questions/what-are-the-main-properties-of-covalent-compounds
Valence electrons in metallic bonding occupy whole piece of metal, they do not connected to particular atom,
in ionic they move to more electronegative atom, in covalent bond they between atoms ( covalent polar located closer to more electronegative)
Answer:
Explanation:
The atomic mass of <em>nickel</em> is 58.963g/mol. Thus, one mole of nickel weighs "exactly" 58.693g.
How much nickel does every coin contain?
![25\%\text{ of }5g=0.25\times 5g=1.25g\text{ of nickel per coin}](https://tex.z-dn.net/?f=25%5C%25%5Ctext%7B%20of%20%7D5g%3D0.25%5Ctimes%205g%3D1.25g%5Ctext%7B%20of%20nickel%20per%20coin%7D)
How many times 58.693g contains 1.25g?
![\dfrac{58.693g}{1.25g/coin}=46.95\approx47coins](https://tex.z-dn.net/?f=%5Cdfrac%7B58.693g%7D%7B1.25g%2Fcoin%7D%3D46.95%5Capprox47coins)
That means that you need to have 47 coins of nickel to have one mole of nickel.